How to parse json array in retrofit with no parameter name?

Question

I have a json array of PDF files. What i need is to parse the pdf file via indexes, as there are no parameter name, just a value as PDF file. You can see my PDF file:

 @Override
                public void onResponse(JSONObject response) {
                    // response
                    Gson gson = new Gson() ;
                    MagazineResponseModel bookResponseModel;
                    bookResponseModel = gson.fromJson(response.toString(),MagazineResponseModel.class);
                    listGridViewBooks.addAll(bookResponseModel.getBooks());
                    mGridView.setAdapter(new MagazineGridViewAdapter(getActivity(),
                            R.layout.custom_books_view, listGridViewBooks));

                }

Here is the example JSON response, i want to parse the first item of "file" array. Does any body have an idea? Let me know if you need more explanation.

{"file": [
  "file1.pdf",
  "file2.pdf"
]  }

Answer 1

 JSONArray fileArray = bookObject.getJSONArray("file");
 for (int j = 0; j<fileArray.length(); j++){
 JSONArray nestedFileArray = fileArray.getJSONArray(j);                                       
 YOUR_MODEL.setFile(nestedFileArray.getString(YOUR_FILE_POSITION));}

I re-write the @droiDev answer for better results